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LR34063D Schematic ( PDF Datasheet ) - LRC

Teilenummer LR34063D
Beschreibung DC-DC Converter Control Circuits
Hersteller LRC
Logo LRC Logo 




Gesamt 12 Seiten
LR34063D Datasheet, Funktion
LESHAN RADIO COMPANY, LTD.
DC-DC Converter
Control Circuits
LR34063
DESCRIPTION:
The LR34063 Series is a monolithic control circuit containing
the primary functions required for DC-to-DC converters.These
devices consist of an internal temperature compensated refe-
rence,comparator, controlled duty cycle oscillator with an active
current limit circuit, driver and high current output switch.This
series was specifically designed to be incorporated in Step-Down
and Step-Up and Voltage-Inverting applications with a minimum
number of external components.
DIP-8
FEATURE:
z Operation from 3.0 V to 40 V Input
z Low Standby Current
z Current Limiting
z Output Switch Current to 1.5 A
z Output Voltage Adjustable
z Frequency Operation to 100 kHz
z Precision 2% Reference
SOP-8
ORDERING INFORMATION
Device
LR34063
LR34063D
Package
DIP-8
SOP-8
BLOCK DIAGRAM
Drive 8
Collector
Ipk 7
Sense
6
VCC
Comparator 5
Inverting
Input
S Q Q2
R
100
Q1
Ipk
Oscillator
CT
Comparator
+ 1.25 V
Reference
Regulator
1
Switch
Collector
2 Switch
Emitter
3 Timing
Capacitor
4
Gnd
(Bottom View)
PIN CONNECTIONS
Switch
Collector
Switch
Emitter
1
2
Timing 3
Capacitor
Gnd 4
8
Driver
Collector
7 Ipk Sense
(Top View)
6 VCC
Comparator
5 Inverting
Input
LR34063-1/12






LR34063D Datasheet, Funktion
8
7
Rsc
Vin 6
LESHAN RADIO COMPANY, LTD.
LR34063
1 Vout 8
7
2
Rsc
Vin 6
R
1
Vout
2
R ³ 0 for
constant Vin
Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 6)
6. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (300 mA) and high driver currents
(30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified
at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non−Darlington configuration is used, the following output drive condition is recommended.
LR34063-6/12

6 Page









LR34063D pdf, datenblatt
LESHAN RADIO COMPANY, LTD.
Mechanical Dimensions (Continued)
DIP-8
LR34063
Unit: mm
f
f
e
e e
f

e e
¶hf



0,1
f
0$;
5
LR34063-12/12

12 Page





SeitenGesamt 12 Seiten
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